diff --git a/actionpack/lib/action_dispatch/testing/assertions/tag.rb b/actionpack/lib/action_dispatch/testing/assertions/tag.rb
index fcfc9316c1e065bd760b9411f4223aafecbac314..d5348d80e1cfa613096596035b1731ce60d83235 100644
--- a/actionpack/lib/action_dispatch/testing/assertions/tag.rb
+++ b/actionpack/lib/action_dispatch/testing/assertions/tag.rb
@@ -1 +1,3 @@
+require 'active_support/deprecation'
+
 ActiveSupport::Deprecation.warn("ActionDispatch::Assertions::TagAssertions has been has been extracted to the rails-dom-testing gem.")